<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 0;
            height: 0;
            border-style: solid;
            border-color: red greenyellow orange plum;
            border-width: 200px 600px;
        }
        .box2 {
            width: 0;
            height: 0;
            border-width: 50px 50px;
            border-style: solid;
            border-color:rgba(255,255,255,0)  rgba(255,255,255,0) rgba(255,255,255,0) rgb(72, 101, 244) ;
            
        }
    </style>
</head>
<body>
    <div class="box"></div>
    <div class="box2"></div>
</body>
</html>